Power-saving jack



Nov; 25, 1930. s'. ,0. RANDOLPH rowan SAVING JACK Filed Sept. 13, 1929 4Sheets-Sheet 1 ATTORNEY S. D. RANDOLPH POWER SAVING JACK 'Nov. 25, 1930.

Filed Sept. 13, 1929 4 Sheets-Sheet 2 DOLPH ATTORNEY s. D. RANDOLPHPOWER SAVING JACK Nov. 25, 1930.

Filed Sept. 13. 1929 4 Sheets-Sheet 5 ATTORNEY Nov.25, 1930. s, D, RANDL H 1,782,512.

POWER SAVING JACK Filed Sept. 15, 1929 4 Shegts-Sheet 4 INVENTOR SAMUELD- RANDOLPH ATTORNEY Patented av. 25,1930 V 1,782,511,

UNITED TAT S. PATENTTOFFICE i s semen]; in. nANnoLr-H, onronr won'rfi,rnx As s v Pownn-snvme JACK a i a I 3 Application flledseptember raisesSeria1 1 1'o. 592,291. s inventionrelates power savingacks bar 114 ispivotally connectedto 'acontrolling a and more;particularly to a jackfor conserv brace 12 which causes a vertical" or per ing'the power andwhich willstandbalanced pendicular movement of thesucker rod 13. yatalmost any pointin the working beat; The. lever 10 is fulcrulnedhinthe uprights andthelobjectis" t c-provide a power jack in 2 -2. ,A linkbar 141 15 pivotally connected 1:.

whichprovisionismade for shifting thereto the lever ,10 and to av lever15 which is 1 sistancelto ofl-setthe load during operation mounted 011 amovable fulcrum 16. A link and to convert the resistance froma-totalloss bar '17 is pivoted on the fulcrum 1'6 and piv or dead weightintoia working force orenergy. otally connected to amovable beam 18.[The Oneof the advantages of the machineis that beam is iulcrumed onamovable fulcrum 19. 6Q thebload is carried directly vertically andAlink bar 20' is pivotallyconnectedto the there isnos'ide thrust ,of theplunger or fulcrum 19 and to the co-operating movable sucker rod.Another advantage is that the fulcrum 9. The fulcrum 9 is carriediin amachine can be operated with a-very small' walking beam 21 whichisi'ulcrumed on the s amount of power. Other objects andadvanuprights;3.; A pitmanjrod 22 ispivotally c5 tages will be fullyexplained in the followconnected to the walking beam 21 and pivingdescription and the invention will: be otally connected t'ocrank arms 23of the crank more particularly pointedout in the claims. shaftlii by a pvotbolt 24 A pitman rod Reference isfihad to the; accompanying 25 ispivotally connected to the crank arms drawingswhich form a part of thisapplica- 26 and pivotally connected to the walking 70 tioni 1 i i a beam7. Supplemental crank ar ns23are Eig'lisaside elevation ofthepowerijackj held inc-fixed parallel relationlto the'crank a Fig. 2 isadetail plan view of thecrank arms 26. Thenarms 23have grooves 27; The i-bolt 24 has a cylindrical portion for con-' and the crankconnections.'1' 1 a (Fig 3 is a perspective view of the same. nection of the pitmanrod 22I1and flat or ?5 Fig.4 is a plan view of the'power jack. squareport1ons 28 on each side of the cylin- Fig, 5 isan end elevation of these ne. drical portion and reduced threaded, por- Fig; 6 isadetail Viewof the bearings for tionsi29 which? are screwed into the arms 23. a

th crankcpnnections; c Cleats 30 areb0ltedto the arms 23011 both -3o.Fig. :7isa side elevation of a power jack sides of the flat portions;This makes the so which-showsaslightvariationfromthemapivot bolti24e nonrevoluble inthe arms 23. chine as shown in thewprevious views. y Thepitman rod 25- is pivotally connected Fig. 8is a side elevationof apower saving to-studs 31 which areintegral with'arms 23.

jack, showinga modification of the jacks The studs'3lhavejflator squareportions 32 i 5 previously shown. which fit in grooves '33 in thearmsrZiG so-that i milar characters of reference are used to thelstuds3i andv the arms 26 are non-'revoluindicate the same partsthrjoughoutthesev: blerelativeto each other: The object of s v eral views.- v V V ithis construction is i to makethe parts (16; The jack is providedwiththree pairs-ofmountable. 3 j, y y i supporting. frame members l-1, 22, and A lever 34L isfulcrumed on apivot bolt 35 i 3+3. Allof theseupright frame members which is mounted in the frame members. 3.

havesupporting. bases 4:. machine is Link bar.36 is pivotally connectedto the v i also provided with upright bearing'membcrs lever (gland tothewalkingbeam 7 andglink 5- 5 for supporting the main crank+shaft.:6,bar 25. The same: pivot bolt 37i servesfor all i l 5 The members 5-5 mayberforked as shown three elements wlink bar 25,1valking beam 95 inFig. 1. The machine or'j ack' is provided and link bars A link bar 38 ispivot-ally with awalking beam 7 which is provided with "connected to thewalkingbeam 15 and to the amovable fulcrum .2} and a co-operatingmovlever 34- anda link bar 39 is pivo-tally conable fulcrum 9 Thefulcrum 8is connected nected to walking beam IS-andto the lever 341 i to ailever10"by;;alink bar 11 and the link Inthe variationshownin Fig. 7 ,Wajlinka 1 bar is pivotally connected to the walking beam 7 and to a floatingauxiliary walking beam. A link bar 43 is pivota ly connected to the beam41 and to the beam 42 which is fulcruined on the frame member 2. Thelink bar is pivotally connected to the lever 34 and to the beam 42. Awalking beam 44 isfulcruined on the upright 2. A link bar is pivotallyconnected to the beam 44 and to beam 4 A link bar 46 is pivotallyconnected to the beam 44 and to the walking beam 21.

In operation, power is applied to drive the shaft ti and this shaftactuates the arms 26 which drives the link bar 25. This bar 25 actuatesthe walking beam 7 and the lever 34. The walking beam 7 actuates thepull rod 13. At the sum; time, the link bar 36 actuates the lever 34 andpower is transmitted by the link bars 86 and 39 through the lever 34 andlink bar 36 and the power thus transmitted cooperates with the powerfrom the crank shaft to operate the beam 7. The vertical movement of thesucker rod 13 is accomplished by the control bar 12. The power 1scompounded from the beam 7 through the link bar 11, beam 10, link bar14, and walking.

beam 15. The power thus coming through the beam 15 is compounded withthe power coming through the link bars 36 and 39 to actuate the walkingbeam 18 and the compounded power is transmitted through the walking beam18 and walking beam 21 and thence through the link bar 22 to cooperatewith the power of the crank shaft 6. A power pulley is provided fordriving the crank shaft 6.

Various changes in the construction, proportion, and arrangement of theseveral parts may be made without departing from my invention.

To illustrate the effect of the several levers and beams and link bars:If a pound is to be raised by the rod 13, apply a pound of power to thepivot connection 37 plus enough power to break the balance and take careof the friction. This will create a double power and make two poundsbear on the pivot connection 8, minus the friction. This two pounds willbe transmitted through'the link 11 to the beam 10. The same two poundswill be transmitted upwardly through the link 14 which draws the beam 15upwardly. The same two pounds will pull upwardly on the beam 15. Enoughpower to equal this two pounds will have to be applied through the beam34 and bracket 34 and link bar 38. This will make an upward pull on thepivot 16 and beam 15 of four pounds. This will pull upwardly four poundson one end of the beam 18. Then sufficient power must be created in beam34 and transmitted through bracket 34 and link bar 39 to the other endof beam 18 to equalize the four pounds upward pull by link 17 on beam 18thereby givin an eight pound pull on pivot 19 and beam 18. The sameeight pounds will be drawn upwardly through link 20 to pivot 9 of beam21. Beam 21 is ratioed two to one and this will give a downward pull offour pounds on the other end of beam 21 which is attached to pitman 22.Pitman 22 is pivotally connected to crank pin 24. The crank is driven bythe shaft 6 and a power pulley 50. This downward pull on link 22 willequal the upward pull on link thus creating a balance. The upward pullon link 25 will be only one-half of the downward pull on link 22 becauseof the longer crank which is necessary to give the movement or stroke onthe power end of beam 7.

The operations give a rectilineal motion to the beam 7 by reason of thepivotal connection of the link bar 12 to the bracket 12 which isstationary on the post 1. A vertical rectilineal motion is given to thesucker rod 13 because the pivot a always moves in the same verticalline, there being no are in the movement of the pivot (1 because the arcis made by the pivot 8.

The mechanical advantage gained is due to the fact that the work is donethrough a lesser distance than that through which the power moves. Thisis accomplished by providing a floating fulcrum 8 for the walking beamand providing a system of levers for coordinately operating this fulcrumfor moving the fulcrum in a direction to shorten the movement of thepower end of said walking beam during the movement of the walking beamon said fulcrum. Such operations result from the shorter stroke of thepower end of the walking beam than is transmitted by the throw of thecrank arm on the power shaft 6. i

In the form of the power jack shown in Fig. 8, there is a modificationof the power jack as shown in Fig. l and in Fig. 7 An additional linkbar 51 is pivotally connected to beam or lever 34. The pivot 8, link bar40, beam 44, link bar 41, link bars 43 and 4G, beam 42, all operate inthe same manner as above described. The link bar 51 is pivotallyconnected to a beam 52 and pulls upwardly on this beam. A link beam 52pushes clownwardly on a beam 54. The beam 52 is fulcrum'ed on posts 2.The link bar 22 is pivotally connected to beam 54 and the beam 54 has aslot 55 for the movement of crank 26. The link bar 25 is pivotallyconnected to the crank 26, as in previous views, and the link bar 25acts on the beam 7 and on link bar 36 which operates beam 34. The linkbar 46 and the beam 21 operate in the manner before described. The beam54 is fulcrumed on the crank 26.

What I claim, is

1. A power saving ack comprising an upright frame consisting of a workend frame, a power end frame, a bearing frame, and a fulcrum frame, awalking beam operatively connected to said work end frame member ZOU andoperatively connected with said power end frame member, and link barsand levers pivotally connecting the ends of said walkmg beam to saidfulcrum frame member, and means operatively connected with said bearingframe for driving said walking beam.

2. A power saving jack comprising an upright frame consisting of a workend frame member, a power end frame member, a bearing frame, and afulcrum frame member, a walking beam, a'lever and a pair of link barspivotally connecting said walking beam to 7 said work end frame member,a pair of levers and a pair of link bars pivotally connecting the powerend of said walking beam to said v first namedlever, and meansoperatively conmember, a power end frame member, a bearing frame, and afulcrum frame member, a

nected with said bearing frame for driving said walking beam. i

3. A power saving ack comprising an upright frame consisting of a workend vframe walking beam, a lever fulcrumed on the said fulcrum framemember, link bars operatively connecting said lever and the work end ofsaid walking beam, a power transmitting lever fulcrumed on said powerend frame member and operatively connected to said walk ing beam, a pairof link bars and a leverjoperatively connecting said power transmittinglever to said first namedlever, and means operatively connected withsaid bearing frame 7 for driving said walking beam. 4. A power saving 'jack comprising an upright frame consisting of a work end frame, member,a power end frame member, a bearthe last named'link bar,- a balancinglever fulcrumed on said power end frame member,

a link bar operatively connecting one end of said balancing lever to thelast named lever,

ing frame, and a fulcrum frame member, a

walking beam, a lever fulcrumed on said fulcrum frame member, link barsoperatively connecting said lever to the power end of said walkingbeam,*a driving wheel and a crank;

therefor jour'naled in said bearing frame, a power transmlttmgleverfulcrumed on said power end frame member and Joperatively connected tosaid crank, anda'lever and a pair of link bars operatively connectmgsaldpower transmitting lever to said first named lever. 7 i

5. A power saving jack comprising an up right frame conslsting of a workend frame member, apowe'rend frame member, a bearing frame, and afulcrum frame member, a

walking beam, a lever fulcrumed on said fulcrum frame member and linkbars operatively connecting said lever and walking beam, adriving wheeland a crank'therefor journaled in said bearing frame, a powertransmitting lever fulcrumedon said power end frame member'and link barspivotally in be connecting said power transmitting shaft and saidwalking beam andsaid crank, a pair of link bars, a lever anda link baroperative lyconnecting one of said link bars to said first named leverand a link bar and a lever operatively connecting the other link bar to

